Japanese authorities have identified the cause of fuel leaks and other problems with Boeing’s 787 Dreamliner aircraft as investigators continue to look at battery problems that led to the entire fleet being grounded last month.

An oil leak on one aircraft was caused by an improper paint job that led to a switch not working properly. Inadequate taping led to cracks in cockpit glass and a faulty part was the cause of braking problems.

The government issued orders to fix the problems found aboard planes operated by Japan Airlines and All Nippon Airways.

Chicago-based Boeing Co. has a facility at Port San Antonio where employees perform modification work on 787 aircraft before final delivery.

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